Zumo 665 Bluetooth

I bought and installed ther 665 from HD and the radio interface and the handlebar mount. Finally got everything installed but can not get the bluetooth phone to work. The 665 earpiece works and the mike on the 665 works. I can not make the system work with the helmet headset. I am able to talk on it when pushing the PTT switch. But that is a one sided conversation. Any help would be appreciated.